GEC No. 5300 Type
PRIVATE AUTOMATIC EXCHANGES
A unit of maximum capacity 50 lines, equipped initially for any desired number up to this total. The switching equipment is mounted on a steel frame, enclosed in a floor-pattern cabinet of polished hardwood. The glass-panelled front of the cabinet is hinged and provided with a lock. A lift-out panel at the rear gives access to the wiring.
Each telephone is connected to the unit by means of a twin conductor.
Alternatively, use can be made of the loud-speaking telephone or S-10 set.
D.C. Mains supply up to 250 volts: two suitable 26 volt batteries are provided, together with a charging panel fitted with the necessary instruments, switches and fuses to enable one battery to be charged through a resistance while the other is supplying the unit.
A ringing vibrator included in the unit converts battery
current to A.C. for ringing bells in the instruments.
26 Volt Rotary System (AC Ringing)
Taken from the GEC Private Automatic Telephone
Exchanges No. 18/2 (undated)
Last revised: August 20, 2012